I. Model Segmentation Analysis (MIFIIPI Standard Coding Rules)
MIFII: Product series name – Multilin MIF II medium-voltage feeder protection and measurement device
PI: Protection configuration level, PI = Basic Overcurrent + Ground Protection Type (PA is Advanced Multi-function Type)
00: Protection function configuration level, 00 is the basic protection configuration
E20: Human-machine interface + communication configuration
E20: With 2-line LCD display, operation keys, front RS232 debugging port
HI0H: Power supply, I/O, hardware model suffix
H: Wide-range universal power supply (AC/DC 85–265V AC/DC adaptive)
I/O terminals, backplane hardware version 0H batch
Core Protection Functions
Current Protection
Phase-to-phase time-limited / reverse-time overcurrent, instantaneous short-circuit protection, grounding fault protection, thermal overload thermal memory protection; compatible with IAC, EPTAR standard current curves
Control Logic
Up to 4 automatic reclosing rounds, circuit breaker failure protection, cold load start locking, programmable custom logic (PLC logic block)
Monitoring and Measurement
Three-phase current, voltage, power, power factor, demand metering; circuit breaker closing and opening times KI2 maintenance count
Event Sequence Recording
32 event sequence records, fault waveform capture, recent 5 times tripping fault snapshot storage
Hardware Interfaces and Communications
Analog Input: Three-phase CT current, grounding CT input; optional PT voltage sampling
Digital DI/DO: Multiple programmable switch quantity input, tripping/alarm relay output
Communication Ports:
Front panel isolated RS232 (Enervista software local debugging)
Backplane standard Modbus RTU (RS485), supports connection to DCS / substation monitoring system
Debugging Software: GE Enervista, UniLink configuration and setting, firmware online flash memory upgrade
Electrical Environmental Parameters
Power Supply: AC/DC 85~265V (Model H compatible with wide-range power supply)
Operating Temperature: -20℃ ~ +60℃, cabinet installation
Installation Form: Standard 19-inch screen embedded panel mounting with opening
Protection: Front panel IP52, rear terminals IP20
Applicable Voltage Levels: 6kV/10kV/20kV medium-voltage distribution network feeders; can also be used as transformer, motor backup protection
Typical Application Scenarios
Urban / industrial substation 10kV medium-voltage outgoing feeder main protection
Factory and mine distribution room high-voltage circuit protection, fan / water pump motor backup protection
Small distributed photovoltaic, self-owned power plant connection point protection and measurement
Metallurgical, chemical, power plant distribution system fault rapid切除 and alarm
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